/*

 * Copyright 2008 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/*

 * @test

 * @bug 6622260

 * @summary javap prints negative bytes incorrectly in hex

 */

import java.io.*;

public class T6622260 {

    public static void main(String[] args) throws Exception {

        new T6622260().run();

    }

    public void run() throws IOException {

        File javaFile = writeTestFile();

        File classFile = compileTestFile(javaFile);

        modifyClassFile(classFile);

        String output = javap(classFile);

        verify(output);

    }

    File writeTestFile() throws IOException {

        File f = new File("Test.java");

        PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f)));

        out.println("@Deprecated class Test { int f; void m() { } }");

        out.close();

        return f;

    }

    File compileTestFile(File f) {

        int rc = com.sun.tools.javac.Main.compile(new String[] { f.getPath() });

        if (rc != 0)

            throw new Error("compilation failed. rc=" + rc);

        String path = f.getPath();

        return new File(path.substring(0, path.length() - 5) + ".class");

    }

    void modifyClassFile(File f) throws IOException {

        String newAttributeName = "NonstandardAttribute";

        byte[] newAttributeData = { 0, 1, 2, 127, (byte)128, (byte)129, (byte)254, (byte)255 };

        DataInputStream in = new DataInputStream(new FileInputStream(f));

        byte[] data = new byte[(int) f.length()];

        in.readFully(data);

        in.close();

        in = new DataInputStream(new ByteArrayInputStream(data));

        in.skipBytes(4); // magic

        in.skipBytes(2); // minor

        in.skipBytes(2); // minor

        int constantPoolPos = data.length - in.available();

        int constant_pool_count = skipConstantPool(in);

        int flagsPos = data.length - in.available();

        in.skipBytes(2); // access_flags

        in.skipBytes(2); // this_class

        in.skipBytes(2); // super_class

        int interfaces_count = in.readUnsignedShort();

        in.skipBytes(interfaces_count * 2);

        int field_count = in.readUnsignedShort();

        for (int i = 0; i < field_count; i++) {

            in.skipBytes(6); // access_flags, name_index, descriptor_index

            skipAttributes(in);

        }

        int method_count = in.readUnsignedShort();

        for (int i = 0; i < method_count; i++) {

            in.skipBytes(6); // access_flags, name_index, descriptor_index

            skipAttributes(in);

        }

        int classAttributesPos = data.length - in.available();

        int attributes_count = in.readUnsignedShort();

        f.renameTo(new File(f.getPath() + ".BAK"));

        DataOutputStream out = new DataOutputStream(new FileOutputStream(f));

        // copy head

        out.write(data, 0, constantPoolPos);

        // copy constant pool, adding in name of new attribute

        out.writeShort(constant_pool_count + 1);

        out.write(data, constantPoolPos + 2, flagsPos - constantPoolPos - 2);

        out.write(1); // CONSTANT_Utf8

        out.writeUTF(newAttributeName);

        // copy flags, class, superclass, interfaces, fields and methods

        out.write(data, flagsPos, classAttributesPos - flagsPos);

        // copy class attributes, adding in new attribute

        out.writeShort(attributes_count + 1);

        out.write(data, classAttributesPos + 2, data.length - classAttributesPos - 2);

        out.writeShort(constant_pool_count); // index of new attribute name

        out.writeInt(newAttributeData.length);

        out.write(newAttributeData);

        out.close();

    }

    int skipConstantPool(DataInputStream in) throws IOException {

        int constant_pool_count = in.readUnsignedShort();

        for (int i = 1; i < constant_pool_count; i++) {

            int tag = in.readUnsignedByte();

            switch (tag) {

            case  1: // CONSTANT_Utf8

                int length = in.readUnsignedShort();

                in.skipBytes(length); // bytes

                break;

            case  3: // CONSTANT_Integer

            case  4: // CONSTANT_Float

                in.skipBytes(4); // bytes

                break;

            case  5: // CONSTANT_Long

            case  6: // CONSTANT_Double

                in.skipBytes(8); // high_bytes, low_bytes

                break;

            case  7: // CONSTANT_Class

                in.skipBytes(2); // name_index

                break;

            case  8: // CONSTANT_String

                in.skipBytes(2); // string_index

                break;

            case  9: // CONSTANT_FieldRef

            case 10: // CONSTANT_Methodref

            case 11: // CONSTANT_InterfaceMethodref

                in.skipBytes(4); // class_index, name_and_type_index

                break;

            case 12: // CONSTANT_NameAndType

                in.skipBytes(4); // name_index, descriptor_index

                break;

            default:

                throw new Error("constant pool tag: " + tag);

            }

        }

        return constant_pool_count;

    }

    int skipAttributes(DataInputStream in) throws IOException {

        int attributes_count = in.readUnsignedShort();

        for (int i = 0; i < attributes_count; i++) {

            in.skipBytes(2); // attribute_name_index;

            int length = in.readInt();

            in.skipBytes(length); // info

        }

        return attributes_count;

    }

    String javap(File f) {

        StringWriter sw = new StringWriter();

        PrintWriter out = new PrintWriter(sw);

        int rc = com.sun.tools.javap.Main.run(new String[] { "-v", f.getPath() }, out);

        if (rc != 0)

            throw new Error("javap failed. rc=" + rc);

        out.close();

        return sw.toString();

    }

    void verify(String output) {

        System.out.println(output);

        if (output.indexOf("-") >= 0)

            throw new Error("- found in output");

        if (output.indexOf("FFFFFF") >= 0)

            throw new Error("FFFFFF found in output");

    }

}